3D foot posture quantification using articular surface information from the template-based deformable model

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In order to describe the 3D posture of the foot, recent approaches have measured several bonny angles associated with the mesh model of segmented bone from the 3D CT data. These methods mimicked the anatomical angles in clinical practice, but they did not share the common reference for the measurement. Hence, the standardization of the 3D foot posture must take precedence for acquiring consistent measurement results. In this paper, we propose a method of quantifying 3D foot posture using a structured bone model with articular surface information. We first constructed a foot template model consisting of 14 bones, whose template shapes were first modeled by averaging the bone segments from the 10 supine CT images. All major articular surface areas for each bone were also identified in the templates. The structured foot (template) model is fitted to 12 WBCT data of healthy subjects by deforming the model to the target images. In this process, we acquire the posture from mutual relationship computed based on the articular surface information. For evaluation, we measured the bone angles for all pairs of neighbor bones in the foot model and compared them to the angles in the template model. The resulting measurements were consistent showing considerably small (< 4˚) standard deviation (SD) for most pairs. From the experimental study, we have constructed reference posture from standing position of the foot. Since the resulting posture represents the neutral position of the foot, it can be utilized as a standard for quantifying 3D posture of a foot.
Publisher
International Forum on Medical Imaging in Asia
Issue Date
2017-01-19
Language
English
Citation

International Forum on Medical Imaging in Asia 2017 (IFMIA 2017), pp.274 - 276

URI
http://hdl.handle.net/10203/225919
Appears in Collection
CS-Conference Papers(학술회의논문)
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